Published in
American Geophysical Union, Geochemistry, Geophysics, Geosystems, 9(14), p. 3730-3750
DOI: 10.1002/ggge.20230
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Tools
Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements
,
Jess Adkins,
Ryuji Asami,
Wim Boer,
Nicolas Caillon ,
David Case,
Kim M. Cobb,
Eric Douville,
Peter deMenocal,
Anton Eisenhauer,
Dieter Garbe-Schönberg,
Walter Geibert,
Steven Goldstein
and other authors.
Full text: Download
Abstract
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 14 (2013): 3730–3750, doi:10.1002/ggge.20230. ; The Sr/Ca ratio of coral aragonite is used to reconstruct past sea surface temperature (SST). Twenty-one laboratories took part in an interlaboratory study of coral Sr/Ca measurements. Results show interlaboratory bias can be significant, and in the extreme case could result in a range in SST estimates of 7°C. However, most of the data fall within a narrower range and the Porites coral reference material JCp-1 is now characterized well enough to have a certified Sr/Ca value of 8.838 mmol/mol with an expanded uncertainty of 0.089 mmol/mol following International Association of Geoanalysts (IAG) guidelines. This uncertainty, at the 95% confidence level, equates to 1.5°C for SST estimates using Porites, so is approaching fitness for purpose. The comparable median within laboratory error is